光谱学与光谱分析 |
|
|
|
|
|
Collisional Energy Transfer between Excited Rb Atoms |
WU Hong-ping, GUO Qi-cun, DAI Kang, SHEN Yi-fan* |
School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China |
|
|
Abstract Energy pooling (EP) was observed in Rb vapor following pulsed optical excitation to the5P1/2 state. The 5P3/2 state was populated by the energy transfer process: Rb(5P1/2)+Rb(5S1/2)→Rb(5P3/2)+Rb(5S1/2). The resulting densities of Rb atoms at the 5P1/2 level were obtained from the absorption of narrow spectral line from a Rb hollow cathode lamp, connecting the 5P1/2 state to 7S state. Since the effective lifetimes of the 5P1/2 and 5P3/2 states are approximately equal, the densities of the 5P3/2 level were obtained from the D2 to D1 fluorescence ratios where D1 and D2 are lines of the 5P1/2→5S1/2 and 5P3/2→5S1/2 transition. Because the time of the fine structure exchanging is much shorter than the lifetime of the 5D state, the fluorescence originating from the 5D state produced by the 5P1/2+5P3/2 and 5P3/2+5P3/2 processes follows the instantaneous production rate of the 5P1/2+5P1/2 process. It is clear that 5P1/2+5P3/2 and 5P3/2+5P3/2 collisions can significantly influence the results obtained for the 5P1/2+5P1/2 rate since the energy defect for 5D state is much smaller for 5P1/2+5P3/2 and 5P3/2+5P3/2 collisions than for 5P1/2+5P1/2 collisions. Effective lifetimes of the 5P levels were calculated using radiation trapping theory. The time-integrated populations and signals were studied and analyzed. The resulting fluorescence included the direct component emitted in the decay of the optically excited 5P1/2 state and the sensitized component arising from the collisions for populating 5D state at different cell temperature. These relative intensities were combined with the measured excited atom densities to yield absolute energy-pooling rate coefficients. The cross sections (in units of 10-14 cm2) for the energy-pooling collisions [i.e., 5P1/2+5P1/2,5P1/2+5P3/2,5P3/2+5P3/2] are 0.78, 2.9 and 3.1, respectively. The dependence of the rates upon energy defect ΔE was examined, but the 5D3/2 level was approximately equally populated in 5P3/2+5P3/2(ΔE=68 cm-1) and 5P3/2+5P1/2(ΔE=306 cm-1) collisions. The 5P1/2+5P3/2 collisions are as efficient as 5P3/2+5P3/2 for populating 5D3/2 state.
|
Received: 2008-06-12
Accepted: 2008-09-16
|
|
Corresponding Authors:
SHEN Yi-fan
E-mail: shenyifan01@xju.edu.cn
|
|
[1] Huennekens J, Wu Z, Walker T G. Phys. Rev., 1985, A31(1): 196. [2] SHEN Xiao-yan, LIU Jing, DAI Kang, et al(沈晓燕,刘 静,戴 康,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2008,28(11):2487. [3] Namiotka R K, Huennekens J. Phys. Rev., 1997, A56(1): 514. [4] Azinovic′ D, Milosˇevic′ S, Pichler G. J. Phys., 2001, B34: 2715. [5] Horvatic V, Movre M, Vadla C. J. Phys., 1999, B32: 4957. [6] Kell J F, Harris M, Gallagher A. Phys. Rev., 1988, A38(3): 1225. [7] Wang Q, Shen Y F, Dai K. Optics Comm., 2008, 281: 2112. [8] Barbier L , Chéret M. J. Phys., 1983, B16: 3213. [9] Gabbanini C, Gozzini S, Squadrito G, et al. Phys. Rev., 1989, A39(12): 6148. [10] WANG Jin, HU Zheng-fa, ZHANG Deng-yu, et al(王 谨,胡正发,张登玉,等). Acta Physica Sinica(物理学报),1998,47(8): 1265. [11] Shen Y F, Dai K, Mu B X, et al. Chin. Phys. Lett., 2005, 22(11): 2805. [12] Theodosiou C E. Phys. Rev., 1984, A30(6): 2881. [13] Jarrett S M, Franken P A. J. Opt. Soc. Am., 1965, 55(12): 1603. |
[1] |
LEI Hong-jun1, YANG Guang1, PAN Hong-wei1*, WANG Yi-fei1, YI Jun2, WANG Ke-ke2, WANG Guo-hao2, TONG Wen-bin1, SHI Li-li1. Influence of Hydrochemical Ions on Three-Dimensional Fluorescence
Spectrum of Dissolved Organic Matter in the Water Environment
and the Proposed Classification Pretreatment Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 134-140. |
[2] |
XIA Ming-ming1, 2, LIU Jia3, WU Meng1, 2, FAN Jian-bo1, 2, LIU Xiao-li1, 2, CHEN Ling1, 2, MA Xin-ling1, 2, LI Zhong-pei1, 2, LIU Ming1, 2*. Three Dimensional Fluorescence Characteristics of Soluble Organic Matter From Different Straw Decomposition Products Treated With Calcium Containing Additives[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 118-124. |
[3] |
GU Yi-lu1, 2,PEI Jing-cheng1, 2*,ZHANG Yu-hui1, 2,YIN Xi-yan1, 2,YU Min-da1, 2, LAI Xiao-jing1, 2. Gemological and Spectral Characterization of Yellowish Green Apatite From Mexico[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 181-187. |
[4] |
HAN Xue1, 2, LIU Hai1, 2, LIU Jia-wei3, WU Ming-kai1, 2*. Rapid Identification of Inorganic Elements in Understory Soils in
Different Regions of Guizhou Province by X-Ray
Fluorescence Spectrometry[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 225-229. |
[5] |
LIU Wei1, 2, ZHANG Peng-yu1, 2, WU Na1, 2. The Spectroscopic Analysis of Corrosion Products on Gold-Painted Copper-Based Bodhisattva (Guanyin) in Half Lotus Position From National Museum of China[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3832-3839. |
[6] |
WANG Hong-jian1, YU Hai-ye1, GAO Shan-yun1, LI Jin-quan1, LIU Guo-hong1, YU Yue1, LI Xiao-kai1, ZHANG Lei1, ZHANG Xin1, LU Ri-feng2, SUI Yuan-yuan1*. A Model for Predicting Early Spot Disease of Maize Based on Fluorescence Spectral Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3710-3718. |
[7] |
CHENG Hui-zhu1, 2, YANG Wan-qi1, 2, LI Fu-sheng1, 2*, MA Qian1, 2, ZHAO Yan-chun1, 2. Genetic Algorithm Optimized BP Neural Network for Quantitative
Analysis of Soil Heavy Metals in XRF[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3742-3746. |
[8] |
SONG Yi-ming1, 2, SHEN Jian1, 2, LIU Chuan-yang1, 2, XIONG Qiu-ran1, 2, CHENG Cheng1, 2, CHAI Yi-di2, WANG Shi-feng2,WU Jing1, 2*. Fluorescence Quantum Yield and Fluorescence Lifetime of Indole, 3-Methylindole and L-Tryptophan[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3758-3762. |
[9] |
WANG Zhi-qiang1, CHENG Yan-xin1, ZHANG Rui-ting1, MA Lin1, GAO Peng1, LIN Ke1, 2*. Rapid Detection and Analysis of Chinese Liquor Quality by Raman
Spectroscopy Combined With Fluorescence Background[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3770-3774. |
[10] |
YI Min-na1, 2, 3, CAO Hui-min1, 2, 3*, LI Shuang-na-si1, 2, 3, ZHANG Zhu-shan-ying1, 2, 3, ZHU Chun-nan1, 2, 3. A Novel Dual Emission Carbon Point Ratio Fluorescent Probe for Rapid Detection of Lead Ions[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3788-3793. |
[11] |
YANG Ke-li1, 2, PENG Jiao-yu1, 2, DONG Ya-ping1, 2*, LIU Xin1, 2, LI Wu1, 3, LIU Hai-ning1, 3. Spectroscopic Characterization of Dissolved Organic Matter Isolated From Solar Pond[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3775-3780. |
[12] |
QI Guo-min1, TONG Shi-qian1, LIN Xu-cong1, 2*. Specific Identification of Microcystin-LR by Aptamer-Functionalized Magnetic Nanoprobe With Laser-Induced Fluorescence[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(12): 3813-3819. |
[13] |
HE Yan-ping, WANG Xin, LI Hao-yang, LI Dong, CHEN Jin-quan, XU Jian-hua*. Room Temperature Synthesis of Polychromatic Tunable Luminescent Carbon Dots and Its Application in Sensitive Detection of Hemoglobin[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3365-3371. |
[14] |
LIN Hong-jian1, ZHAI Juan1*, LAI Wan-chang1, ZENG Chen-hao1, 2, ZHAO Zi-qi1, SHI Jie1, ZHOU Jin-ge1. Determination of Mn, Co, Ni in Ternary Cathode Materials With
Homologous Correction EDXRF Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3436-3444. |
[15] |
LI Xiao-li1, WANG Yi-min2*, DENG Sai-wen2, WANG Yi-ya2, LI Song2, BAI Jin-feng1. Application of X-Ray Fluorescence Spectrometry in Geological and
Mineral Analysis for 60 Years[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(10): 2989-2998. |
|
|
|
|